Trailer



G. A. JOHNSON TRAILER Filed Oct. 2, 1942 Aug. 3, 1943.

IINVENTOR. 7 p fuzzy/0p G/ad/ TORNEY l Thefforward and rear truck-assemblies: 23 an I 24' are operatively interconnected by a pair of cross reach links 32 and 33, each of whic-h 'has-a' 7 forwardvertical bearing portion 34 atrits frontv end, and a rear bearing portion 35 at its rear" end, the arrangement beingsu chthat cameras the p in vfollowsz, The trailer is drawn fo'rward by'fmeans'of a sible between. the

l re

mounted on one ofthe straight crossaiile shafts 25 or 26, and arranged to support a rotatable.

' kingpins l5 and ll, respectively, and each of the plates is provided with shortslots .3 or .32, in

line with thea'xle and arranged to intersect the longitudinal guide slots 2| and 22, respectively in the plates M or IE, respectively. -'Ihe slots 3| claim as new and desire to secure by Letters 7 V extend in a radial direction with respectto the I kingpins. l5 and i1.

Ward vertical bearing portions 34 0f the' cross sreaohilinks egrten'd throughthe slots 2| infthe .plate; iq anialso through theYradial slots Kl in;

* the shiftable plate 28. Similarly; the arten;-

35 extend-through the. slots- 22 in -the rear plate lfi; and through the' radial'slots. 32 in" the shittableplatelih i a hei rw r ru9 9 li w t adrawbarl :35; pivotally interconnected with the plate .28 (at The operatiori of the device is "as "prime mover which engages the drawbaniit so that. simian li m ion; the draw a will b wu ,to one side or the other to pivot the. front truck around the kingpin 'I 5, ..and;thu s; cause thetr'ailer V to v follow directly. behind the prime niover..'. .j As this occurs, thdmovmntibfthe frontaxleas-M gs e mloly 23,; and .rnoreparticularly of the plate 28, will shift the reach lihks32 ant-i 33 longitudinally to pivot the; rear truck' zflin an ,equal and opposite direction withrespect to the-inclina- .tion of the"frontlwheels; In this connection it should be. particularly hated. that the bearings 34 amiss ofthe cross reach'bars defic swin in an arcuate patharound the Kingpins, but move in the'guide' slotsfll and 22',respectively;softhat" they moveldirec tly forward or back in astraight,

when the prime mover' deviates from lin path er'moveme tr v It should alsobje notedthati'alth'ough the bear- ;ihgstiiand 3.5 ektend 'throu'gh slots injthe" plates [28 and"29;"res'peeuve1y, o. lostmotion is posrward and rear truck ass'em- 'blies, sincefjthej.""itersectionfof the radial slots 3| anti 32,. and th'elongitudinal guide slots 7 2 and 22, respectively, are at such an? angle' that the" ingi cbnnection between theifront and rear whelsis entirely positive 'at all times. I

From the, fo egqing itwill beapparentthat the disadvantages of the prior devices areoV'ercome,

- 'I-Iavi ng thus described my invention w-ha't l Patent is:

1. In a'trailer, ing' longitudinal beams and transverse beams,

together with a forward truck bearing plate sup-.

porting-a vertical kingpin, and a rear truck bearing plate supportinga vertical kingpin; a front steering truck and a rear steering truck, each of from onesideofthe forward truck to the opposite side of the rear truck; bearing surfaces connecting thecross reachlinks with the'forward' a straight line path of movement extending longitudi'riallvon each side of the kingpins of said 1: I frame and; provided with straight longitudinal 20 l V V l .heari:ngs, also being shit-table with respect to the" -t' trucks in a-direction -radi al of,v the 'kingpins and ide m m e eass ia e Wi hi f m the provided. with front, and rear jradi'aljg'uidesl --.12.;In-: a trailer, in combination a frame/together with a forward. vertical kingpin, and a real, vertical; kingpin; a front steering momma a rear steering Ytrugk, each oi said trucks being imounted on oneof saidkingpins-and including i l;a-zstraigh f i yfilfir lielse a eh nej h rotatably mounted on eaoh of its endg a'pa'ir-of V ;cross;r ea-ch:linksextendin respectively; et s r qtiir ibein h iz each 10f said; trucks, including straight rigid transverse. axle having wheels retatably mounted on :ea'ch of. its. ends; a .p f S. gh lin extending; from; one side of the forward truck .Tto theroppQsite side of. the rearitruck; bearing surfaceswcjonnecting the cross reach iinks with :thiorWa-r'dand :rearrgtrncks, respectively; the structuiie being; characterized byareach linkbear- P ings. slnfta'ole. in 1 a straight line path; 01'' .-move ment f extending longitudinal-1y an, .efi lh siide ef guides above. and in th p ne. Qf th IQ iteachings' of the present invention provide a I 1 "novel and improvedtrailer structure wherein the 60V n me; axles;respectively -wardand rear.axlegmespectively V 4. In a'trailer in ccmbinatiom-a fra aiiejto- :gethenwith, orwardj truck and a rear truck;

each .7 of .said. trucks f-havin'g. wheels rotatably inoun'te'cl :01'1 '"eachofdtssiclos;a pair of cross reach-'lin-ks extending from Y one side i of the for;-

arcl and rearltrucks, respectively; a'eing characterized by; straight longitudinal guide; memhers associated. withthe lying; above .;-the forward. and rear in combinati0n,.a frame includ- GLAnsronn-A mer e 

